Задание 157 Вариант 1 Самостоятельная работа ГДЗ Дидактические материалы Чесноков 5 класс (Математика)

$$1\ \text{га} = 100\ \text{а} = 10\,000\ \text{м}^2;$$

$$1\ \text{км}^2 = 100\ \text{га}.$$

а)

$$7\ \text{га} = 7 \cdot 10\,000\ \text{м}^2 = 70\,000\ \text{м}^2;$$

$$12\ \text{га}\ 500\ \text{м}^2 = 120\,000\ \text{м}^2 + 500\ \text{м}^2 = 120\,500\ \text{м}^2;$$

$$23\ \text{а} = 23 \cdot 100\ \text{м}^2 = 2\,300\ \text{м}^2.$$

б)

$$15\ \text{га} = 15 \cdot 100\ \text{а} = 1\,500\ \text{а};$$

$$3\ \text{га}\ 4\ \text{а} = 300\ \text{а} + 4\ \text{а} = 304\ \text{а};$$

$$1\,800\ \text{м}^2 = 1\,800 : 100\ \text{а} = 18\ \text{а}.$$

в)

$$780\,000\ \text{м}^2 = 780\,000 : 10\,000\ \text{га} = 78\ \text{га};$$

$$83\,000\ \text{а} = 83\,000 : 100\ \text{га} = 830\ \text{га};$$

$$3\ \text{км}^2 = 3 \cdot 100\ \text{га} = 300\ \text{га}.$$

г)

$$680\ \text{а} = 600\ \text{а} + 80\ \text{а} = 6\ \text{га}\ 80\ \text{а};$$

$$157\,600\ \text{м}^2 = 150\,000\ \text{м}^2 + 7\,600\ \text{м}^2 = 15\ \text{га}\ 76\ \text{а}.$$